<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #bd {
            padding: 0 200px 0 180px;
            height: 100px;
        }
        
        #middle {
            float: left;
            width: 100%;
            height: 500px;
            background: blue;
        }
        
        #left {
            float: left;
            width: 180px;
            height: 500px;
            margin-left: -100%;
            background: #0c9;
            position: relative;
            left: -180px;
        }
        
        #right {
            float: left;
            width: 200px;
            height: 500px;
            margin-left: -200px;
            background: #0c9;
            position: relative;
            right: -200px;
        }
    </style>
</head>

<body>

    <body>

        <div id="bd">
            <div id="middle">middle</div>
            <div id="left">left</div>
            <div id="right">right</div>


        </div>

    </body>

</body>

</html>

圣杯修改测试
电脑1测试
电脑2提交测试
电脑1测试2

ssh提交测试